Back scrubber



FIG. 1 is a front perspective view of the back scrubber showing my new design;

FIG. 2 is a rear perspective view thereof;

FIG. 3 is a front elevation view thereof;

FIG. 4 is a top plan view thereof;

FIG. 5 is a bottom plan view thereof;

FIG. 6 is a rear elevation view thereof;

FIG. 7 is a right side elevation view thereof; and,

FIG. 8 is a left side elevation view thereof.

The broken lines shown in FIG. 3 of the drawings illustrate environmental structure that forms no part of the claimed design. 

CLAIM The ornamental design for a back scrubber, as shown and described. 